Telephone-exchange system.



H. P. CLAUSEN TELEPHONE EXCHANGE SYSTEM.

PFLICATION FILED APR.12,'1917 /n Ven far.' Henry P. Van/sen Patented Jafn.15,1918.

- ED srarns PATENT OFFICE.

mail P. CLAusEN, or MOUNT VERNON, NEW YORK, assxcNon rro WESTERN ELEG- TRC COMPANY, INCORPORATED, OF NEW YORKLN. Y., A CORPORATION OF NEW YORK.

frnLnPHoNE-EXCHANGE srs'rniuy Specification of Letters Patent. Patented Jan. 1.5, 191.8.

apuntaba mea prix 12, i917. :serial No; iene-os.

b all 'whom it may concern Be -it known that l, HENRY P. CnAusEN, a tizen of the United States,` residing ,at

ount Vernon, .in the county of Westchester id State ofl NewYork, have invented cerin new and useful Improvements in Teleione-Exchange Systems, of which ther folF wing is a full, clear, concise, and exact defipti on. l

This invention relates to telephone ex.

ange systemsand more particularlyito :hsy'stems of thecentral energy. type' iny l,ich the connection of an operators teleoneset with a calling telephone -line is.

)matically connecting an operators telene set therewith upon connection being e with a calling line. Should a second circuit be connected with a second line e the operators telephone set-is conecl with the first link circuit. the operatelephone setl is thereupon disconnected I. the first and connected with the second circuit, and upon completion ofthe ection bv way of the second link circuit, perators telephone set is automatically nnected therefrom and reconnected the irst link circuit. 3 is invention is illustrated in the ac anying drawing. whereinall apparas shown in its normal' and nnactuated tion.

the drawing there are shown two tele- I a lines A and B which extend from 'ibers stations and terminate at aceniiice.- There is also shown located at entral otlice two link circuits C and ie link circuits vare similarly equipped; for convenience, the same apparatus h will be designated bv the same refcharacter. the only distinction made by the addition throughout the deon ofthe letter C or D to designatef oper link circuit. It will be underhat a large number of telephone lines to A and B may terminate at this oiice and that more-link circuits common resistance-12, nornial contact of y calling sleeve relay 13, alternate contact of l*tacts of the answering plug 5 and the line than those shown may also be provided for y.

interconnecting the telephone lines. However, for convenience only the two telephone lines and the two link circuits are shown. It 1s thought that. the nature of this inven- 60 tion 1s such that' it can ybe best understood from a. description of the operation of the system disclosed in the drawing and it will be so described.

:Assuming that the subscriber -of telephone c5 line A has initiated a call in the usual man;

ner, the operator inl answering inserts an- 'swer'ing plug '5 of. cordcircuit CA into line jack 16 of line A. 'The cut-olf relay' 7 of line A is thereuponvoperated over a circuit from battery through answering supervisory lamp 8, normal contact of answering supervisory relay 10,'sleev'e contacts of theanswering .plug 54 and line jack 6' and the winding of cut-oi relay 7 to ground.` The answering vsupervisorylamp 8 jwould light over this circuit were it not Afor the fact that the an. swering" supervisory relay 10. immediately in circuit with the lamp 8 and reducing `the amount of current through the lamp to suchv an extent that it is-prevented from lighting. A Upon the actuation of the answering supervisory relay 10, listening relay 1l 1s actuated over acircuit from battery through a answering supervisory relay l0, winding of listening relay 11, resistanceA `14, sleeve con!y jack .6 andwinding of the cut-0E relay 7 to ground. Listening relay 11 in operating, connects the operators telephone set to the talkingistrands of the cord circuit C. The common resistance 12 limits the amount of current through the winding-of listening relay 11 and resistance 14.' The resistance 14 is of such nature that when cold the ohmic resistance thereof is very low, but when heated up as when currentis traversing it` the ohmic resistance thereof increases quite rapidly. This resistance 14 may be of the forni of a ballast lamp such as is shown and described in Patent No. 854203 to C. D. Enochs. Since the common isistance 12 limits the amount of current through. this circuit the increase in resistanof the coil 14 is thereby limited 'to such a lextent that f while it will decrease the amou of current operates, thereby including the resistance 9 i 4 4circuit D into the line jack'of the other line which has initiated the call. The answering supervisory relay l0-D immediately oper-v ates, thereby causing the'energization' and operation of listening relay 11 D over a circuit from battery through common resistance l2, normal contact of calling sleeve relay 12S-D, alternate contact of answering 'supervisory relay 10-D, winding of listen-v ing relay l1-D, resistance 11i-D, the sleeve contacts of the answering plug 5D and the line jack'and. Winding of the cut-oil relay of the calling line to ground. The operation of relay llv--D connects the opera;

tors telephone 'set to the talking strands of the cord circuit D. -The circuit includin' the winding ofi-listening relay ll-D an resistance 1-1-D established upon the operation of answerino supervisory relay 10-D 1s of comparative yjlo'vr resistance and is in multiple with the circuit including the Winding of relay ll-C and coil 14h-(l.v The'.

--sistance, while the ohmic resistance'of the coil 1li-D. is comparatively low so that the establishment of this sec'ond circuit includ,-

ing the Winding of relay.1l--Dv and resist#v 7' ance coil 14e- D diverts sufficient current .from the circuit including the Winding of relay ll-C andthe coil 14-D, to cause relay ll-C to release its armatures, thereby disconnecting the operators telephone 'set 2 from the cord circuitvC.

The operatorupon being advised of-'thefv number of the line with which' the second calling party desires to b e coiiiicct/ e c l,`.`inserts the calling plugl-D into'4 the line jack of the line desired, 'whereupon the" calling sleeve relay` 13-D and thel cut-olfl relay of the line operate, and calling supervisory lamp 21 -D lights. yRelay 13'-D, in operating,

opens the energizing circuitof relay 11-D, which now releases to disconnect'the operators .telephone set from the cord circuit D.

Immediately upon the opening of this cird cuit through the Winding of relay I1-D, more current is permitte the operators telephone setto the operates to connect a Isource of ringing curto iow through the winding of relay ll-C, whereupon this y "relay again attracts its armatures, recon-4 nectin ,cord circuit-C. .'Upon the-operation of relay 13e-D, ringingf'relay 16'-D immediatelyV r, rer:

18e-D operates, thereby removing the short,

circuit of a lock-up relay 19, which operates' and locks up, short-circuiting relay 16'-D, which then releases its armatures, dlsconnecting ringing current from the called line Calland establishing the talking circuit.

ing supervisory relay QO-D thereupon opcrates to extinguish the calling supervisory vlamp 21`D.

Upon-the vreconnection of the operators telephone set to the cord circuit C in the mannenhereinbefore explained, the'operator -mav converse with the subscriber of line A,

and upon learning the number of the line with which connection is'A desired, inserts the calling plug 15,;0 into the line jackv of line B, itbeingassumed that this is'the line withwhich connection is desired. Callfing sleeve relay 13-C and the cut-olf relay, ofthe line B are thereupon operated, and

calling supervisory lamp 21-0 is lighted The operation of ringing the call bellat the station on line B'is performed in fthe-man-v ner hereinbefore4 explained. In responseto f tigex operatio1i of th1s 4callfbell subscriber B removesthe receiver. from theswitchhoohf.

whereupon ringing current is removed Vfrom line B and thera'lling superirisory: relay/. 20-C is operated to extinguish the calling supervisory!4 lamp 21 -'C. -At the conclusion of the conversationfbetween subscribersA and B and between the .subscribers ..connected togetherbytmeansof i d cord circuit D, the restoration to theswitche vhoolrsfof'the receivers causes the release ofthe supervisory relays ofthe cord circuit"s,x, whereupon-the 'supervisory lamps .areIlightn :re- ,l ',sponse to thesedisconnect signals the oper-r; -ator -reniovesthe plugs from -the jacks and the' apparatus returned to. itsnormalaoned' "to 'flirnish disconnect signals.

this invention may. be thoroughly underl" stood,I the following more detailed statements regarding the operation-of the listening relays vof two cord circuits may -be of` assistance. The common resistance 1 2 serves to limit the amount of current availablein either of the listening relaycircuits for lthe operation of the respective relay', i' j This available currentis enoughvto supply 11-.D

' with suicientcurrent for drawing-u its 'armatures when" its `associated coil r is cold. However-,. when therst cord.' 'icu'it C is connected with acalling line, and its relay v1 1 1s operatedfand its resistanoe'coil 14 is'hot,1 tlie connection-of the cord lcircuit D with another-calling line, Whilethe-re',-

'sstane coill lflefll yiseold, shunts -awnyilfrom relay ll-G enough currentfto cause y vrelay 11a- Cf to release 4its armatures,but

'even though the cord circuitD remains ,ils-rent 17 to. the called line. 'Upon'the 're- "l'i'rspp'nse ofv the calledfpartytnpping relay fconnected. for a sufficient length of,v time tol .permit the heating-of resistanmilflr-Drd i the release .phone set therewith,

nect the operators the listening relay 11- D its armatures.

ays, and it o eratin the listening rel p g o C andy ll-D hen two relays branch ,will be less only one relay is in circuit.

hat is claimed is:

. l. A telephone exchange system compris` ing telephone lines, set, the link circuit with y telephone set therewith, circuit, means actuated upon thevsecond a' second lin tion of /the operators telephonel set from the second link circuit and th thereof/With therst link circuit..

2. A 'telephone set, 'a linkfv'circuit, a relayenergized upon: connection of the t e lines to link one end of t other of the lines for operating ythe relay o the second 'link circuit and for causin `t e denergization of the relay` he operating circuit, thereby causing of -the second mentioned relay and set, a 1in an operating circuit for the relay established in circuit with one of the l n circuit, a relay therefor 'operated to connect the operators tele upon connection of one Y set, link cuit adapted-l re ay completediupon an operators telephone:

' y 'tion o one operatin 1 `is alread i establishe g" `cuit associated with the e reconnection -1 set, a link circuit, a exchange systemicornprisf L When energized to connect the operators ing telephone lines, an operator-fs telephone @cuit for lthe rel link circuit with one of ytfionfoi the link circuit with operators telephone.

circuit, a relay.` t

e second link circuitl with ari-1 t.

the energization of the first mentioned` relay. 3. A telephone exchange system comprising telephone lines, an operators telephone circuit, a relay thereforadapted connect the qperators teleupon connection ofthe tliLanperatingv circuit therefor magnetic switch operating endl of of the other end for causing ,the

lines and serving to divert current from the operating circuit of the first mentioned relay, thereby causing the release thereot, and

the relay in the connect therewith t e operators telephone set.

A.- telephone exchange system comprisin'gte'lephone lines,` an operators telephone circuits, a relay in each link cir- When operated to elated lin r circuit With' a line, the comple` 'circuit while another causing the diversion o current therefrom to release the relay `ot` the first engaged link l esponsive tothe connection of the link cirone operating cirfor causing the diversion of curi-ent from the other operating circuit to release ,1. t'erelay thereof and creased flow of Y "circuit to thereby again` operate the relay l tor causing an iiicurrent inthe one operating 5. Atelephone exchange system comprising'telephoneliiies, an operators telephone relay therefor adapted hone set therewith,

an energizing cirenergized to connect the o to d relay'thereof" and the energization of the relay -of the rst link circuit.

telephone exchange system comp telephone lines, a link circuit connected 4Wit one of jthe li1ies,`an operators telephone set connected with the link circuit, a

for connecting the set the second link circuit, and an electrolink circuit disconnection of the operlphone, set from the second link circuit and l causing vthe operation `of ,Iirsttlink circuit to again BEST ' ators telephone set Jfrom the second link cir-i cuit and the connection thereof with the first link circuit. A y l 7. A telephone exchangesystem comprising telephone lines, a linklcircuit connectedv with one of the'lines, an operators telephone set`-connected with the'link'circuit, a second link circuit, a relay in the first link circuit i responsve to the connection of one end of the second link circuitlwith another of the lines for disconnecting-the operators telephone set from the first link circuit, a relay ,/-energizecl 'upon' connection of the second link circuit with that line to connect the operatorstelephone set therewith, and a relay actuated upon connection of the other end of the second link circuit with -a third line to cause the denergization of the-otherlre-k lay thereof and the energizationvofthe relay .l of the first linkcircuitfto again connect'the operators telephone set therewith. y

8.V A telephone exchange system 'compris ing telephone lines, a link circuit connected with one of the lines, an operators telephone' set connected with the link circuit, a lsecond* link circuit, a relay for the second link cir' Acuit ada ted Whenlenergized to connect the operator s telephone set therewith, an'ener gizing circuit for the relay completed upon connection ofy one endV of the second `link with another line, a resistanceelementfhaw' ing a high positive temperature coeiiicient, a

relay denergized byf the coperation of .the resistanceelement andthe energizing circuit upon the'com'pletion thereof to .disconneet the operatorsgtelephone set from thel first 11nk circuit, and means responsive to the connection of the other end of the-'second link circuitV with; another line to cause the disconnection of the vope'ratd1"s telephonerset of' with the 'itirst link circuiti-py 9. A telephone exchange ystem cornpris-I,-

from the second and thereconnection there-4 ,y

ing telephone lines, a link 'c'ircuit,"anV operi ators telephone set, a resistance element-having a high positive temperature coefficient, a

relay adapted-'When energized'fto connect the l operators telephoneset with.' the link c ir cuit, an energizing circuit for'the relay 1ncluding the resistance element complet/ed u on connection ofthe link circuit with one o the lines, a second link circuit,A a relay,

therefor adapted when operated'to'connect- 1 the operators telephone set With''the"'s'ec,cn1gl1l Alink circuit, and an operating circuit .there-h' for completed upon connection offthefsec ,0nd link circuit withl another of the lines and' coperating With'the resistance element vto i denergize' -thefirst relay.

10. A telephone exch nge'svysteinigco-nipri-sl" ing telephone lines, a'link; circuit connected lWith one of the lines, an operator-s telephone set connected with the"l link circuit,a resist? 'ance element vhavin'ga highi positive temperature coeiiicienmya ecco'nd link circuit,'f65

means foindisconn'ecting,theop'erators tele;4

phone set frrolngtlie firstI link-1 vcircuit; arelay adapted Whenuoperated to connect tlie'jopeeif4 kators telephone set with the second link c'irmyfnaine this 10th day loi 'April A. D., 1917, AHENRY 1),. CLAUSEN.

. In witness whereof, 1 hereunto subscribe 

